When Judy Moody gets serious about protecting the environment, her little brother Stink thinks she is overdoing it, but she manages to inspire her third grade class to undertake an award-winning, environment-saving project.
Judy is excited about becoming a doctor, especially when Class 3T starts a new unit on the human body, but she learns more about being a patient when she catches tonsillitis from her little brother, Stink.
When Stink discovers that Pluto has been downgraded from a planet to a dwarf planet, he launches a campaign in his classroom to restore its status to that of a full-fledged member of the solar system.
"The lucky penny in Judy Moody's pocket sure does seem to be working. She can't stop winning-at bowling, spelling, the unbeatable Prize Claw, everything! For sure and absolute positive, she'll ride that wave of good fortune all the way to Washington, D.C."--
As Judy and the rest of the Virginia Dare Bookworms prepare for the Book Quiz Blowout competition against second- and third-grade readers, her team discovers the other group has a fourth-grader and worry about their chance of winning sets in.